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Net Income per Common and Common Equivalent Share (Tables)
 8 Months Ended
May 09, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table shows the amounts used in computing net income per share and the weighted average number of shares of basic and potentially dilutive common shares outstanding (shares in 000s):
12 Weeks Ended36 Weeks Ended
May 9,
2021		May 10,
2020		May 9,
2021		May 10,
2020
Net income attributable to Costco
$1,220 $838 $3,337 $2,613 
Weighted average basic shares
443,043 442,322 443,043 442,054 
RSUs1,084 1,533 1,293 1,700 
Weighted average diluted shares
444,127 443,855 444,336 443,754 
Anti-dilutive RSUs
1,046 — — —